Decimals
Multiplying
Decimals
To multiply
decimals, line
up the
numbers, not the
decimal points.
Then multiply
the numbers as usual.
Count the number of digits in both numbers that
lay to the right of the decimal points.
Place the decimal point in the
answer so that there are an
equal number of digits to the
right of the decimal point.
The answer should contain that number of digits
to the right of the decimal point.
To Multiply
7.6 X
2.4
7.6 has
1 digit to
the right of its
decimal point.
2.4 also has
1 digit to
the right of its
decimal point.
1 +
1 =
2.
The answer should have
2
digits to the right of its
decimal point.
7.6
X
2.4
304
152
18.24
(Place the Decimal Point so there are 2 Digits to the Right)
Since the
decimal points
do not need to line up, there is no reason to add any
zeroes as
temporary
place holders.
To multiply
4.12 X
3.4
line up the numbers and count the
total number of
decimal points.
4.12
X
3.4
1648
1236
14.008
(Place the Decimal Point so there are 3 Digits to the Right)
Remove any
trailing zeroes
from the final answer.
5.4 x
2.5
5.4
X
2.5
270
108
13.50
=
13.5
Include a
leading zero
if necessary.
1.2 x
0.3
1.2
X
0.3
.36
=
0.36
RULE
Multiplying Decimals.
Multiply the
numbers as usual.
Count the number of
Decimal Points
in both numbers.
Move the
Decimal Point of the
answer the same
number of places.
Remove any
Trailing Zeroes.
Use a Leading Zero
if necessary.